5182铝合金热轧再结晶模型

Recrystallization Model for Hot rolling of 5182 Aluminum Alloy

在Gleeble 15 0 0热模拟机上采用双道次热变形软化法 ,建立了 5 182铝合金热轧再结晶数学模型。对该模型的分析发现 ,再结晶百分数对应变速率非常敏感 ,在一定的变形温度条件下 ,当应变速率 ε 1s-1时再结晶完成所需的时间相当短暂。此外 ,还运用再结晶百分数 保温时间 变形温度 (R t T)的关系曲线 ,提出了铝合金热轧过程显微组织演变的控制轧制技术 ,即在现有的可逆式热轧机上 ,通过控制最后道次的轧制温度、轧制速度和卷取前的冷却速度 。

WT5”BZ][ST5”BZ]A recrystallization model for hot rolling of 5182 aluminum alloy has been presented by means of the fractional softening during double interval deformations on Gleeble 1500 It is found that the recrystallization rate depends on strain rate more sensitive than deformation temperature,and the times for full recrystallization are very short as strain rate is greater than 1s -1 .Using the recrystallization time temperature curve,the desirable hot rolled microstructure should be controlled by controlling the rolling speed,temperature and cooling rate before coiling during the last pass in reversing mill.